Filters allow useful light to enter the eye while filtering out disturbing light, maintaining vision. Tints do not discriminate between light waves and can reduce vision by blocking both useful and disturbing light. Filters come in various colors for specific diagnostic purposes like enhancing blood vessel visibility, while tints are not used diagnostically. Therapeutically, filters are used to control light sensitivity and enhance contrast for various eye conditions, while tints only help reduce glare in cataracts and albinism without enhancing contrast. Filters are available only in plastic while tints come in both plastic and glass.

1. Presented by;
MUHAMMAD RIZWAN
BILAL CHOHAN
ASAD IQBAL

2. Allowanceofusefullight:
Filters:
• Filters “filter out” the disturbing
light and while at the same time
allow useful light to enter the
eye.
Tints:
• Tints does not discriminate
between light waves that cause
disturbance and the useful light
waves that helps to see.

3. Effectonvision:
Filters:
• Filters does not reduce vision as
they allow useful light to enter in
the eye.
Tints:
• Tints are effective in reducing
glare but they tend to reduce
vision at the same time.

4. Visiblelighttransmissionfactor:
Filters:
• There is no concept of VLT in
filters.
Tints:
• A very dark tint may allow only
2% of visible light to transmit,
whereas light tint may allow 50%
or 60% of visible light to transmit
hence enhancing vision.

5. Fordiagnosticpurpose:
Filters:
• Cobalt blue: enhance view of
fluorescein in the tear film of eye.
• Neutral density filter:reduce the
visibility of moving objects.
• Red free: used to enhance the view
blood vessels and hemorrhages.
• Green and red filters: used for color
vision and to asses diplopia and
suppression, in Hess chart.
Tints:
• Tints aren’t used for diagnostic
purpose.

6. Fortherapeuticpurpose:
Filters:
• Glare avoidance: in patients with
cataract, ocular albinism, RP, post
chamber IOL, vitreous opacities,
macular edema etc.
• Contrast enhancement: in patients
having AMD, RP, cataract, DR,
albinism, cone dystrophy.
• Control for light sensitivity: in patients
with corneal abrasions, uveitis,
detached retina, and refractive
surgery.
Tints:
• In patients of cataract and albinism
to reduce glare.
• Tints does not enhance contrast.
• Tints are given in cataract,
postoperatively in cataract and
refractive surgery.

7. Filters: Tints:
For cosmetic purpose:
• Filters aren’t used for cosmetic
purpose.
• Tints are used cosmetically.
Available in plastic or glass:
• Filters are only available in plastic. • Tints are available in both plastic and glass.
Weight:
• Filters are light weight. • Tints are heavy weight if are available in glass material.

8. Accordingtocolor:
Filters: Tints:
Black: They aren’t black. In sunglasses and in car windows.
Yellow: For enhancing contrast in
glaucoma, RP, in LVA patients, in
red/green anomaly.
Cosmetically, RP, AMD.
Yellow orange(amber): In developing cataracts, glaucoma,
aphakia, pseudophakia, macular
degeneration, and retinal diseases.
Isn’t used in tints.
Pink and blue: Isn’t beneficial in filters. Aphakia, indoor and computer
workers.
Brown and gray: Isn’t used in filters. For photophobia, better contrast
and in hazy conditions(albinism, in
sunglasses).

9. Indifferentoccupations:
Filters: Tints:
Red:
Used for emergencies. Used for caution, traffic signal and hunting.
Great for penetrating in fog or smoke.
Green:
Used for hunting and hiking.
Mostly for welders(absorb IR and UV).
Also very popular for night time map
reading on operations and traffic signal
Blue:
Used for night fishing and in tracking games. Used in spotlights.